THE SUPERSTITION CAULDRON COMPLEX by Michael F

THE SUPERSTITION CAULDRON COMPLEX by Michael F. Sheridan Department of Geology Arizona State University

This one-day field trip examines the rock types, stratigraphy, struc­ ture and petrology of the volcanic units associated with the Supersti­ tion cauldron complex. Most stops are located along the Apache Trail, but there will be some hikes across rugged desert terrain.

INTRODUCTION cauldron and the Tortilla caldera. Earlier-described cal­ The Superstition-Superior volcanic field is one of several deras are superceded by these structures as defined by their mid-Tertiary silicic centers in the Basin and Range province boundary faultson this map. of southern Arizona. Tuffs associated with this field cover an irregular area approximately 100km in diameter (fig. 1). The geology of the westernpart of this fieldhas been inves­ tigated by students at Arizona State University (Fodor, 1968; Stuckless, 1969, 1971; Malone, 1972; Sedgeley, 1976; Suneson, 1976; and Hillier, 1977). Rocks in the east­ ern part of the field have been examined by U.S. Geologi­ cal Survey scientists (D. W. Peterson, 1960, 1961, 1968, 1969; Creasy and others, 1975; N. P. Peterson, 1954, 1962, 1963; Peterson and others, 1951; and Ransome, 1903, 1919). DIIIl1IIII Tortilla Caldera < 15m.y.

� Goldfield Caldera 15-16 my.

� Superstition Caldera 25 m.y. 60,70

10 15 20 25Km

80,89 Figure 2. Detail of the three principal cauldrons. Main faults shown with the ball on the down-dropped side.

Mes■ Apaeh• Junetlon In this report cauldron is used to describe a large sub­ / circular volcanic collapse structure, the topographic expres­ I I sion of which has been erased by erosion. Caldera refers to I a similar collapse structure that retains some or all of its I topographic rim. In this sense the Superstition and ,_ Goldfieldstructures are cauldrons, but the Tortilla structure is a caldera. The Superstition resurgent cauldron is filled 10 20Km with a thick section of welded tuffthat has been arched up to produce a broad dome with a central graben. The Figure 1. Distribution of volcanic rocks associated with the Super­ Goldfield cauldron is composed of at least three tectonic stition-Superior field. Superstition cauldron (S), Goldfield cauldron (G), and Tortilla caldera (T) are indicated by the line pattern. blocks tilted to the northeast (fig. 5) so that the southwest half of the structure has little or no vertical displacement and relatively thin infill units. The Tortilla caldera is an Sheridan and others ( 1970) were the first to recognize arcuate graben filled with lahar that lies within a topo­ large cauldrons in the Superstition area. Subsequent map­ graphic rim capped with a rhyolite lava. ping has confirmed the existence of the Superstition caul­ The stratigraphy of the Superstition area is now fairly dron and defined its limits. However, a revised interpre­ well known, although several significant questions still re­ tation (fig. 2) shows two new structures, the Goldfield main unanswered. Figure 3 shows stratigraphic columns for

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I I 15.2m.y.

2000 16.3m¥-

Figure 3. Stratigraphic columns: 1) Precambrian granite, 3) latite com­ I: plex, 4) Siphon Draw member, Super­ stition Tuff, 6) breccia of First Water, 8 & 9) rhyodacite domes and lavas, 10) Geronimo Head tuffs, 11) Geronimo Head lavas, 12) Canyon Lake mem­ 1000 ber, Superstition Tuff, 14) breccia 24.4mr of Mesquite Flat, 15) basalt of Willow Spring. Goldfield Caldera

0 Superstition thickness Caldera in meters infill deposits of the Superstition and Goldfield cauldrons. The Goldfield caldera sequence began at a slightly later Documentation of the ages was done by Damon (1969) and time with the extrusion of rhyodacite domes, lavas, and IC Stuckless and Sheridan (I 971). There are two principal breccias at 20 to 21 m.y., coincident with similar lavas in stratigraphic units: I) the Superstition Tuff, a rhyodacite the Superstition caldera. A period of quiet was followedby l:C welded tuff composed of several members, and 2) the the eruption of the Geronimo Head tuffsand lavas resulting Geronimo Head Formation, a rhyolitic non-welded tuffand in major caldera collapse at 16 m .y. A final phase of activ- g; lava sequence. ity fromthis caldera produced the Canyon Lake member of The oldest volcanic rocks of the Superstition cauldron are the Superstition tuff, a 15 m.y. old welded tuff sheet that ti; alkali basalts that are interbedded with or overlie arkosic extends at least 20 km northeast of the caldera rim. conglomerates. The major volcanic episode began with the The stratigraphy of the Tortilla caldera is not yet well extrusion of a ring of latite domes during a period from 29 documented by radiometric dates. Basalt and latite similar to 25 m.y. ago. This phase ended with the eruptionof the to that of the Superstition cauldron occur northeast of the Siphon Draw member of the Superstition Tuff and collapse structure in Horse Mesa. Rhyodacite lava similar to that of of the Superstition caldera at 25 m.y. ago. A period of the Goldfield cauldron is located along the northern caldera resurgence marked by rhyodacite lavas dated at 20 to 21 rim beneath a thick sequence of tuffs and lavas similar to m.y. was followed by caldera infill by the breccia of First those of the Geronimo Head Formation. The most distinc­ Water and the post-caldera basanite of Black Mesa. tive units in this caldera are the rim rhyolite lava and its

10 F

ALK

Figure 4. Chemical variation diagrams for volcanic rocks from the Supersti­ 06N � 5 tion cauldron complex. (From Sune­ + : ... son, 1976.) .. 0 4 N SUBALK < 3 ,' z

o--�---�---�--�- 40 48 56 64 72 80 A M Si02

86 associated graben-filling lahar. Above and ti'elow the lahar Hillier,Mark, 1978, A geochemical study of the older dacite complex, are thin alkali basalt flows. Superstition Mountains,Arizona: Tempe,Arizona, Arizona State University,M.S. thesis. The rocks of this complex fall into two •petrographic Lipman, P. W., Prostka, H. J., and Christiansen, R. L., 1972, suites (fig. 4). The dominant series is composed of calc­ Cenozoic volcanism and plate-tectonic evolution of the western alkali silicic rocks ranging from latites through rhyolites. United States. I. Early and Middle Cenozoic: Phil. Trans. R. Soc. Land.,ser. A,v. 271,p. 217-248. However, a minor series of alkali basalts occurs below and Malone, G. B., 1972, The geology of the volcanic sequence in the above the major silicic sequence. Data fromisotopic studies Horse Mesa area, Arizona (M .S. thesis): Tempe, Arizona, (Stuckless and O'Neil, 1973) and petrologic models Arizona State University,68 p. Peterson,D. W.,1960, Geology of the Haunted Canyon quadrangle, (Malone, 1972; Stuckless, 1971) suggest an independent Arizona: U.S. Geol. Survey Map GQ-128. origin foralkalic and calc-alkalic suites. The transition from Peterson, D. W., 1961, Dacite ash-flow sheet near Superior and calc-alkali to basalt volcanism in this area at 15 to 18 m.y. Globe, Arizona (Ph. D. thesis): Stanford, California, Stanford (Suneson and Sheridan, 1975) is consistent with similar University,130 p. Peterson, D. W.-, 1966, Geology of Picket Post Mountain, northeast changes throughout the Basin and Range province (Lipman Pinal County,Arizona: Ariz. Geol. Soc. Dig.,v. 8,p. 159-176. and others, 1972). Peterson, D. W., 1968, Zoned ash-flow sheet in the region around Superior, Arizona: Ariz. Geol. Soc. Southern Arizona Guidebook III,p. 215-222. Peterson, D. W., 1969, Geologic map of the Superior quadrangle, TABLE I-SYMBOLS FOR MAP UNITS Arizona: U.S. Geol. Survey Map GQ-818. Peterson, N. P., 1954, Globe, Arizona-Geology: U.S. Geol. Survey Map GQ-41. Peterson, N. P., 1962, Geology· and ore deposits of the Globe-Miami B3 basalt of Willow Springs district,Arizona: U.S. Geol. Survey Prof. Paper 342,151 p. Peterson, N. P., 1963, Geology of the Pinal Ranch quadrangle, BRm breccia of Mesquite Flat Arizona: U.S. Geol. Survey Bull,1141-H, 18 p. Peterson, N. P., Gilbert, C. M., and Quick, G. L., 1951, Geology RH rhyolite of HorseMesa and ore deposits of the Castle Dome area, Gila County, Arizona: U.S. Geol. Survey Bull. 971,134 p. B2 basalt of Canyon Lake Ransome,F. L.,1903, Geology of the Globe copper district,Arizona: U.S. Geol. Survey Prof. Paper 12,168 p. Sc Canyon Lake member,Superstition Tuff Ransome, F. L. 1919, The copper deposits of Ray and Miami, Arizona: U.S. Geol. Survey Prof. Paper 115,192 p. H. Gt tuffs of Geronimo Head Formation Schmincke, U., 1967, Graded lahars in the type section of the Ellensburg Formation,south central Washington: Jour. Sed. Pet., GI iavas of Geronimo Head Formation v. 37,p. 438-448. Sedgeley, D.R., 1976, A paleomagnetic study of some welded tuffs Bl basalt of Black Mesa in central Arizona: Tempe, Arizona, Arizona State University, M.S. Thesis, llOp. BRo breccia of First Water Sheridan,M. F.,Stuckless, J. S., and Fodor, R. V.,1970, A Tertiary silicic cauldron complex at the northern margin of the Basin and RD rhyodacite lavas Range province, central Arizona, U.S.A.: Bull. Volcanol., v. 34,p. 649-662. Ss Siphon Draw member,Superstition Tuff Stuckless, J. S., 1969, The geology of the volcanic sequence as­ sociated with the Black Mesa caldera, Arizona (M .S. thesis): LT latite lavas,breccias, and domes Tempe,Arizona, Arizona State University,79 p. Stuckless, J. S., 1971, The petrology and petrography of the volcanic Bo older basalts sequence associated with the Superstition caldera, Superstition Mountains, Arizona (Ph. D. thesis): Stanford, California, Stan­ AK arkosic conglomerate ford University,112 p. Stuckless, J. S., and O'Neil, J. R., 1973, Petrogenesis of the GR Precambrian granite Superstition-Superior volcanic area as inferred from strontium­ and oxygen- isotope studies: Geol. Soc. America Bull., v. 84, p. 1987-1998. Stuckless,J. S., and Sheridan,M. F.,1971, Tertiary volcanic stratig­ raphy in the Goldfield and Superstition Mountains, Arizona: Geol. Soc. America Bull.,v. 82, p. 3235-3240. REFERENCES CITED Suneson, N. H., 1976, The geology of the northern portion of the Superstition-Superior volcanic field, Arizona: Tempe, Arizona, Creasey, S. C., Peterson, D. W., and Gambell, N. A., 1975, Pre­ Arizona State University,M.S. thesis,114 p. liminary geologic map of the Teapot Mountain quadrangle, Pinal Suneson, N. H., and Sheridan,M. F.,197 5, ,Geology of the northern County,Arizona: U.S. Geol. Survey open-file rept. no. 75-314. portion of the Superstition-Superior volcanic field,Maricopa and Damon, P. E., 1969, Correlation and chronology of ore deposits and Pinal Counties, Arizona (abs.): Geol. Soc. America, abs. with volcanic rocks: U.S. Atomic Energy Comm., Ann. Prag. Rept. prog.,v. 7,no. 7,p. 1287-1288. no. C00-689-120,90 p. Wohletz, K. H., 1977, A model of pyroclastic surge: Tempe, Fodor,R. V .,1969, Petrology and petrography of the volcanic rocks Arizona,Arizona State University,M.S. Thesis,174 p. in the Goldfield Mountains, Arizona (M.S. thesis): Tempe, Wohletz, K H., and Sheridan,M. F., 1978, A model of pyroclastic Arizona,Arizona State University,66 p. surge: Geol. Soc. AmericaMem. (in press).

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88 ROAD LOG AND STOP GUIDE Granitic pediments in Apache Junction The location map for the road log and stop guide (fig. 5) lead north to the tuff- and lava-capped shows the Apache Trail, the three cauldrons with major fault blocks of the Goldfield Mountains. faults, the eight topographic maps, and the ten geologic 20.2 20.2 Apache Trail. Turn north onto the Apache stops. The topographic maps, reproduced at a scale of trail and proceed along the boundary zone 1:30,000, appear adjacent to the appropriate text without between the Goldfield and Superstition further description. Stops are indicated by bold numerals cauldrons. enclosed in ovals. Faults are shown with the ball on the 5 .8 26.0 1. To the east is a view of the down-dropped side. Map units are indicated by the symbols STOP Superstition resurgent dome at Siphon shown in table 1. Draw (MAP 1). To the west is the MILES boundary fault of the Goldfield cauldron. Interval Total The lowland area between the mountain 0 0 Start of trip, 8:00 a.m. Corner of Rural ranges is composed of tilted fault blocks of Road and University, Tempe. Take Uni­ granite (GR), arkose (AK), older basalt versity Drive east to the Apache Trail. (Bo), and latite (LT), typical of the ring Driving through Tempe, the Precambrian fracture zone surrounding the Superstition McDowell mountains are seen to the cauldron. A ring of latite domes and north. Near Falcon Field in Mesa the tilted composite volcanoes surrounds the Tertiary red-beds 9f Red Mountain occur Superstition cauldron. Looking to the east, to the north. Further east are the at least 5 of these small volcanoes can be Precambrian granites of Usury Mountain. seen. The oldest date obtained from the

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base of the latite is 29.0 ± 0.5 m.y. (Stuckless and Sheridan, 1971). At about 25 m.y. ago faulting coincident with the eruption of the Siphon Draw member of the Superstition Tuff took place along the ring of latite volcanoes. The foundered caldera block was filled with rhyodacite Figure 6. Typical textures in the welded tuff: outflow units spread to the breccia of First Water. San Tan Mountains, 50 km to the south. Resurgence shortly followed producing a structural dome with a broad central graben. The mountain mass directly east is the south flank of this structure. 2.3 28.3 Road to First Water. Follow this road eastward for about 2.5 miles and park. 2.1 30.4 STOP 3. Weavers Needle Vista. This is This turnoff, shown at the bottom of MAP the northern end of a horst block between 3, follows a dirt road across the ring the Superstition and Goldfield cauldrons. fracture zone of the Superstition caldron Bedrock at this location is the Precambrian into the resurgent dome. Road log mileage granite that has decomposed into a gruss is not recorded for this leg of the trip. soil. Hogback ridges to the east are successively arkosic conglomerate (AK), older basalt (Bo), and latite (LT). Good exposures of this section may be seen in Take a short hike along the STOP 2. road cuts between and Garden Valley Trail toward Second Water STOP 3 STOP 4. To the west is the fault line scarp of the after entering the Superstition Wilderness Goldfield cauldron. Latite (LT), 2). This trail successively crosses (MAP rhyodacite and Geronimo Head tuff the Siphon Draw member of the (RD), (Gt) are down-dropped into contact with Superstition Tuff (Ss), rhyodacite lava granite, arkose, and older basalt. The and the breccia of First Water (RD), vertical displacement on this fault locally (BRo). Resting on this breccia about 1.5 exceeds 1.5 km. Visible on the skyline to km to the east is the basanite of Black the north are the younger laharic breccias Mesa dated at 17.8 ± 3 ..1 m.y. (Damon, of Mesquite Flat that are overlain by the 1969). The Superstition tuff, 1 km to the youngest basalt flow (B3 of MAP 4). east, was dated at 22.6 ± 1.0 m.y. (Damon, 1969). Follow the Garden Valley trail eastward 2.5 32.4 STOP 4. Apache Gap. A rhyodacite for about 600 m to a small hill where the dome (RD) is intrusive into older tuffs and breccia of First Water is well exposed. breccias (MAP 4). The dome has a glassy This breccia is composed of lahars that selvage and well-developed flow banding filled the central graben of the Superstition roughly conformable with its outline. A cauldron. Bedding thickness ranges from notable large-scale fold occurs just north 30 cm to 1 m for individual flows. The of this point. beds are commonly composed of a massive A number of en echelon curving faults lower portion and a cross-bedded upper mark the edge of the Goldfield cauldron part (fig. 6) similar to the lahars of the throughout the area of MAP 4. One major Ellensburg Formation of Washington segment passes southwest of the dome at (Schmincke, 1967). A fissile silty layer Apache Gap: another cuts south of Mormon marks the sharp parting between beds. Flat Dam. North of Apache Gap is a section Mudcracks and rain imprints are common of more than 1,000 m of tilted Geronimo along these partings. Head tuff (Gt) and lava (G 1). Beyond the Return to the bus and take the dirt road cauldron boundary fault north of Canyon back to the Apache Trail where the road Lake the Geronimo Head Formation is com­ log resumes. posed of only 200m of flat-Iying tuffs.

91 92 l Between STOP 4 andSTOP 5 are the best 5.6 40.8 STOP 6. Tortilla Flat. We have passed exposures of Geronimo Head tuffs and through MAP 5 to MAP 6 while remaining lavas. A few rhyolite dikes with prominent essentially within the Canyon Lake member. flow-bandingare also cut by the road. Good exposures of this unit occur in the bed of Mesquite Creek north of Tortilla Flat where dates of 14.9 ± .08 and 15.4 ± 0.8 m.y. were obtained (Stuckless and Sheridan, 2.3 32.5 STOP 5. Canyon Lake Overlook. Here is 1971). Here the welded tuff overlies a lava the northeastern margin of the Goldfield dome of the Geronimo Head Formation cauldron. This glassy rhyolite lava with red (G 1) and is overlain by a basalt lava (B2) spherulites has been dated at 16.0 ± 1.3 and the breccia of Mesquite Flat (BRm). m.y. (Stuckless and Sheridan, 1971). At This rhyolitic welded tuffwas a late-stage about 200 m to the northeast the Canyon product of the Goldfield cauldron. It ponded Lake member of the Superstition Tuff (Sc) in depressions along the northeasternsection rests conformably on the Geronimo Head of the caldera wall at Canyon Lake (STOP tuff(Gt). A basalt flow (B2) and the breccia 5) and formed thin outflow sheets in basins of Mesquite Flat (BRm) successively overlie as at Tortilla Flat (STOP 6) and Goat Moun­ the welded tuff. Inside the Goldfield caul­ tain, 16 km to the east. dron these units are in northeast-tilted fault For the most part this tuff is densely blocks, but outside the cauldron they are welded, but at Tortilla Flat considerable flat-Iying. variation in compaction textures is noted.

93 CORONADO MESA

LEGEND ( ll1JSa ndwave Faciea \ 1M) Maulve Faciea � Planar Faclea ---..._

S5 Sample Location � Lava of Geronimo � Head Formation ( f:-, Tuff of Geronicno LJ Head Formation / _, Fault �0

Figure 7. Map of the pyroclastic surge facies of the Coronado Mesa vent. (From Wohletz, 1977. )

0 \

Paleomagnetic work of Sedgeley (1976) as From this vantage point the rim rhyolites well as variations in compaction suggest that can be seen along the near skyline to the there are at least two cooling units in this north. To the west is a graben fault that has C sheet. displaced the laharic breccia. At the west end of this fault an intrusive rhyolite dome C 2.8 43.6 STOP 7. Mesquite Flat View Point. The has turnedup the lahar beds to a near-vertical past two kilometers of Apache Trail have position. passed through outcrops of the breccia of 1.2 44.8 Horse Mesa Dam Road. Bear left onto the Mesquite Flat (BRm). This lahar has filleda dirt road leading to Horse Mesa Dam. This broad arcuate graben that extends for 14 km road traverses Geronimo Head lava (G 1) along the down-dropped side of the Tortilla that projects above the former surface of the caldera boundary faults (fig.5). The rhyolite breccia of Mesquite Flat (MAP 7). The de­ of Horse Mesa (RH) that extends for 8 km tailed geology along this part of the trip is along the caldera rim is the host for the lithic shown on figure 7. Coronado Mesa, the inclusions of the lahar, suggesting a genetic broad ridge to the northeast of the road, is a relationship between units. Perhaps this rhyolitic vent complex that developed during basin was subsiding as the rim rhyolites were Geronimo Head time. A series of pyroclastic erupting. Lahars, generated from the rhyo­ surge deposits that issued from a vent near li tes, poured into the basin forming the the center of the mesa was subsequently Mesquite Flat breccia. covered by cogenetic lavas (Wohletz and

94 Sheridan, 1978). Sandwave fa;ies of pyro­ clastic surge deposits crop out to the north of the road as we travel towards STOP 8.

1.8 46.6 STOP 8. Coronado Mesa. Pyroclastic surge deposits typically show a three-fold concen­ tric facies distribution surrounding the vent (Wohletz and Sheridan, 1978): 1) a proximal sandwave facies dominated by sandwave­ type beds, 2) a medial massive facies charac­ terized by a sub-equal abundance of sandwave, massive and planar beds, and 3) a distal planar faciesdominated by planar-type beds. The distribution of surge facies for Coronado Mesa is given in figure 7. Strati­ graphic columns for a sandwave facies loca­ tion (S-7) and a planar facies location (S-1) are shown in figure 8. STOP 8 at location S-1 allows close examination of the planar faciesof this deposit: About 100 m to the north is the boundary fault forthe Tortilla caldera. Flat-lying tuffs

S-7 S-1

. - oa i.ao--- �Oo,o-a..

and lavas of the Geronimo Head Formation (Gtl) are capped by the thick rhyolite of Horse Mesa (RH). Outcrops of this lava mark the erosional remnants of the north rim of the Tortilla caldera. As we drive to STOP 9 there are numer­ ... 1 .. . ':"" . . . • .. .- ' � • -•• '!. ous lava domes of the Geronimo Head For­ � ...., . .- : :-: � • _. _ • .. _o • • • ...... -: .- . _..,,,._ .o . mation that erupted from local vents in the . o. t? --"-- - "I!' .':I' ••- .. -.-••---· -. vicinity of Fish Creek (MAP 7). Many of � • o •...... � .. these domes have associated pyroclastic surge deposits. This concentration of vents is taken as further evidence for the proximity of the caldera ring fault. ;;{{:;t{-M1 A good exposure of the ring fault passes "',; -- - ·'° � o. -? .. � • . o. o - 'tt' o through the switchbacks below STOP 8. .• . ,..- ...• � ..·o.. �- . 0,- Y,. . - Ci! 0, • � •.� ••• Silicified fault breccia stands in relief as an �-• . .-: o.•. • P .. -�­ • -- o. � .• a, � .•.o .•....,,, ---�ii;' __ -. erosional dike with polished slickensides 1m 0 \_�--�.\ �-- ��-- : O ·· -�' · ·. · o' . ·. o· along the contact, to the west of the road P1 � . . ·.. o- • •• .. 0 • below Black Cross Butte. To the east the

0 r:,,· .� o_::. �-- .. -M 1 near-vertical sinuous fault trace is - Cl· - � accentuated by the contrast of dark lava dis­ ·_ · •• --� -.� � .. ::" .. 0 . 0 .:·. ,,___ . · placed against light tuff. Several branching Figure 8. Sections of planar facies (S-1) and sand wave facies (S-7) of faults along the switchbacks have caused pyroclastic surge deposits at Coronado Mesa. (From Wohletz, 1977 .) local development of low-angle faults.

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2.8 49.4 STOP 9. Salt River. At the base of the Fish less follows the caldera boundary fault. We !::t Creek Canyon (MAP 8) is a good exposure will hike a few hundred meters along the of the rhyodacite (RD) below the Geronimo ridge to the north (MAP 8) fora better view Head tuffs and lavas (Gtl). This rock is of the geology. To the east the caldera C fresh and glassy withphenocrysts of plagio- boundary fault passes along the switchbacks I:: clase, quartz, alkali feldspar, biotite, in the road. The breccia of Mesquite Flat hornblende, augite, and hypersthene. This (BRm) is displaced down into contact with � unit typically occurs within a fewkilometers the latite (LT) so that the 300 to 500 m sec- of the margin of the later rhyolitic cauldrons tion of Geronimo Head Formation (Gt) is (Goldfield and Tortilla), and probably repre- missing. To the east a series of faultswith a sents a tumescent stage of eruption. similar sense of movement add to the total Returnto the Apache Trail. displacement along the caldera margin. 4.6 54.0 Apache Trail. Bear left on the Apache Trail While standing on the breccia of Mesquite and continue along the margin of the graben Flat, the contact with the underlying containing the breccia of Mesquite Flat. To Geronimo Head formation can be traced to the north is the erosional scarp of the Tortilla the east and the west. Yellow tilted caldera marked by the flat-lying rhyolite of Geronimo Head tuffs (Gt) are in unconform- Horse Mesa (RH). able contact with the brown flat-lying brec- cia of Mesquite F1at(Brm). 3.1 57.1 STOP 10. Fish Creek Overlook. Between STOP 8 and STOP 10 Fish Creek more or End of field trip.Return to Tempe.

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